Detect malformed nested JSONB earlier and stop rendering to avoid long

delays.

FossilOrigin-Name: 72f3e1d0eca2b9ebd7c4b4cdccc6d7a0173b2fdb204cb1aa207917aedab6098a

manifest

@@ -1,5 +1,5 @@
-C When\sgenerated\stext\sJSON\sfrom\sJSONB,\sdo\snot\scontinue\sdescending\sinto\nnested\sstructures\safter\san\serror\sis\sseen.\s\sThis\savoids\slong\sloops\sand\swait\ntimes.
-D 2024-01-29T20:36:17.909
+C Detect\smalformed\snested\sJSONB\searlier\sand\sstop\srendering\sto\savoid\slong\ndelays.
+D 2024-01-29T21:09:56.917
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -698,7 +698,7 @@ F src/hash.h 3340ab6e1d13e725571d7cee6d3e3135f0779a7d8e76a9ce0a85971fa3953c51
 F src/hwtime.h f9c2dfb84dce7acf95ce6d289e46f5f9d3d1afd328e53da8f8e9008e3b3caae6
 F src/in-operator.md 10cd8f4bcd225a32518407c2fb2484089112fd71
 F src/insert.c 3f0a94082d978bbdd33c38fefea15346c6c6bffb70bc645a71dc0f1f87dd3276
-F src/json.c 25472b53ce9a07f2fd1388714596ab0a1cf626c9af8829fe1d9f6e2040a8d6f5
+F src/json.c 4f824b70a65c426f4ff518f99adb9b4fb97d6c8692e59c4525cae453972853f5
 F src/legacy.c d7874bc885906868cd51e6c2156698f2754f02d9eee1bae2d687323c3ca8e5aa
 F src/loadext.c 7432c944ff197046d67a1207790a1b13eec4548c85a9457eb0896bb3641dfb36
 F src/main.c 438b95162acfa17b7d218f586f5bde11d6ae82bcf030c9611fc537556870ad6b
@@ -2161,8 +2161,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P ad06868807a27f0c96fa5649ebd981e07909eb2c5e03781377c876fdec49abdc
-R 62cbadfc42bb4fb45ef8f78c92a43c6e
+P 97666ec052ebaceab002874d7ca5c5e6883c3d04fb7d3992235a8c4c8d08407a
+R 95e4cc745d61f1468c48968bf1c52952
 U drh
-Z 909c63b99a1f269d1aa20de0ece0fbe3
+Z e9314520b095df0616cee88d0104a95d
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-97666ec052ebaceab002874d7ca5c5e6883c3d04fb7d3992235a8c4c8d08407a
+72f3e1d0eca2b9ebd7c4b4cdccc6d7a0173b2fdb204cb1aa207917aedab6098a

src/json.c

@@ -2274,6 +2274,7 @@ static u32 jsonTranslateBlobToText(
         j = jsonTranslateBlobToText(pParse, j, pOut);
         jsonAppendChar(pOut, ',');
       }
+      if( j>iEnd ) pOut->eErr |= JSTRING_MALFORMED;
       if( sz>0 ) jsonStringTrimOneChar(pOut);
       jsonAppendChar(pOut, ']');
       break;
@@ -2287,7 +2288,7 @@ static u32 jsonTranslateBlobToText(
         j = jsonTranslateBlobToText(pParse, j, pOut);
         jsonAppendChar(pOut, (x++ & 1) ? ',' : ':');
       }
-      if( x & 1 ) pOut->eErr |= JSTRING_MALFORMED;
+      if( (x & 1)!=0 || j>iEnd ) pOut->eErr |= JSTRING_MALFORMED;
       if( sz>0 ) jsonStringTrimOneChar(pOut);
       jsonAppendChar(pOut, '}');
       break;